85K views · 1.4K reactions | On Mars, astronauts would need to live and work in three-eighths of Earth’s gravitational pull for up to two years. Additionally, on the six-month trek between the planets, astronauts will experience total weightlessness. Discover what we're doing to protect humans from this hazard of spaceflight: https://go.nasa.gov/2od586t | NASA - National Aeronautics and Space Administration | Facebook

For the longest time the question of what causes gravity was not so well understood. Watch particle physicist James Beacham tells us more | Royal Institution of Great Britain